/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.qax.task.timer.core;


import com.qax.task.logger.Logger;
import com.qax.task.logger.LoggerFactory;
import com.qax.task.timer.NamedThreadFactory;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;


/**
 * @author lianglei
 */
public class ScheduledCompletableFuture {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private static ScheduledExecutorService EXEC_EMBED_SCHEDULER = Executors.newSingleThreadScheduledExecutor(new NamedThreadFactory("exec-scheduler"));

    private static ScheduledExecutorService DELAY_SCHEDULER = Executors.newSingleThreadScheduledExecutor(new NamedThreadFactory("delay_scheduler_scheduler"));

    public static <T> CompletableFuture<T> schedule(
            Supplier<T> task,
            long delay,
            TimeUnit unit
    ) {
        CompletableFuture<T> completableFuture = new CompletableFuture<>();
        EXEC_EMBED_SCHEDULER.schedule(
                () -> {
                    try {
                        return completableFuture.complete(task.get());
                    } catch (Throwable t) {
                        return completableFuture.completeExceptionally(t);
                    }
                },
                delay,
                unit
        );
        return completableFuture;
    }


    public static <T> CompletableFuture<T> scheduleFixedDelay(
            Supplier<T> task,
            long initialDelay,
            long delay,
            TimeUnit unit
    ) {
        CompletableFuture<T> completableFuture = new CompletableFuture<>();
        DELAY_SCHEDULER.scheduleWithFixedDelay(
                () -> {
                    try {
                         completableFuture.complete(task.get());
                    } catch (Throwable t) {
                         completableFuture.completeExceptionally(t);
                    }
                },initialDelay,
                delay,
                unit
        );
        return completableFuture;
    }


    public static <T> CompletableFuture<T> submit(
            Supplier<T> task
    ) {
        CompletableFuture<T> completableFuture = new CompletableFuture<>();
        EXEC_EMBED_SCHEDULER.submit(
                () -> {
                    try {
                        return completableFuture.complete(task.get());
                    } catch (Throwable t) {
                        return completableFuture.completeExceptionally(t);
                    }
                }
        );
        return completableFuture;
    }

}
